Spray masking plug



FIG. 1 is a perspective view of a spray masking plug showing my new design;

FIG. 2 is a front view thereof, the rear, left side and right side views being identical thereto;

FIG. 3 is a top view thereof; and,

FIG. 4 is a bottom view thereof. 

CLAIM The ornamental design for a spray masking plug, as shown and described. 